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RuleReversal


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Description

Summary

Whether a MatchedRule can be read backwards, and where it cannot, what stops
it.

Remarks

Not every rewrite has an inverse worth having, and this says which do.x - x -> 0 is a rewrite nobody wants to read backwards and nobody could: from
0 there is no recovering which x was cancelled. That is
ReplacementDropsHoles, and it is a fact about the rule rather than a
judgement about it.

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